US Patent 9970467 Handheld power tool

An expansion anchor including a bolt and an expansion sleeve surrounding the bolt is provided, the bolt having: an expansion cone in the region of the front end of the bolt, which expansion cone radially enlarges the expansion sleeve when moved into same; a threaded section for introducing tensile forces into the bolt; a shoulder that limits a movement of the expansion sleeve away from the expansion cone; and at least one anti-rotation protrusion for inhibiting a rotation of the expansion sleeve in relation to the bolt, the protrusion originating at the shoulder and protruding radially outwards on the bolt. The axial length of the anti-rotation protrusion is smaller than the pitch of the threaded section arranged on the bolt.